diff options
| -rw-r--r-- | drivers/firmware/efi/libstub/efistub.h | 15 | ||||
| -rw-r--r-- | drivers/firmware/efi/libstub/file.c | 78 | ||||
| -rw-r--r-- | include/linux/efi.h | 6 |
3 files changed, 87 insertions, 12 deletions
diff --git a/drivers/firmware/efi/libstub/efistub.h b/drivers/firmware/efi/libstub/efistub.h index e85916ed5311..1fde9cbe6899 100644 --- a/drivers/firmware/efi/libstub/efistub.h +++ b/drivers/firmware/efi/libstub/efistub.h @@ -179,6 +179,21 @@ union efi_device_path_to_text_protocol { typedef union efi_device_path_to_text_protocol efi_device_path_to_text_protocol_t; +union efi_device_path_from_text_protocol { + struct { + efi_device_path_protocol_t * + (__efiapi *convert_text_to_device_node)(const efi_char16_t *); + efi_device_path_protocol_t * + (__efiapi *convert_text_to_device_path)(const efi_char16_t *); + }; + struct { + u32 convert_text_to_device_node; + u32 convert_text_to_device_path; + } mixed_mode; +}; + +typedef union efi_device_path_from_text_protocol efi_device_path_from_text_protocol_t; + typedef void *efi_event_t; /* Note that notifications won't work in mixed mode */ typedef void (__efiapi *efi_event_notify_t)(efi_event_t, void *); diff --git a/drivers/firmware/efi/libstub/file.c b/drivers/firmware/efi/libstub/file.c index 246ccc5b015d..20d3530ca9c5 100644 --- a/drivers/firmware/efi/libstub/file.c +++ b/drivers/firmware/efi/libstub/file.c @@ -43,6 +43,13 @@ static efi_status_t efi_open_file(efi_file_protocol_t *volume, efi_file_protocol_t *fh; unsigned long info_sz; efi_status_t status; + efi_char16_t *c; + + /* Replace UNIX dir separators with EFI standard ones */ + for (c = fi->filename; *c != L'\0'; c++) { + if (*c == L'/') + *c = L'\\'; + } status = volume->open(volume, &fh, fi->filename, EFI_FILE_MODE_READ, 0); if (status != EFI_SUCCESS) { @@ -111,16 +118,61 @@ static int find_file_option(const efi_char16_t *cmdline, int cmdline_len, if (c == L'\0' || c == L'\n' || c == L' ') break; - else if (c == L'/') - /* Replace UNIX dir separators with EFI standard ones */ - *result++ = L'\\'; - else - *result++ = c; + *result++ = c; } *result = L'\0'; return i; } +static efi_status_t efi_open_device_path(efi_file_protocol_t **volume, + struct finfo *fi) +{ + efi_guid_t text_to_dp_guid = EFI_DEVICE_PATH_FROM_TEXT_PROTOCOL_GUID; + static efi_device_path_from_text_protocol_t *text_to_dp = NULL; + efi_guid_t fs_proto = EFI_FILE_SYSTEM_GUID; + efi_device_path_protocol_t *initrd_dp; + efi_simple_file_system_protocol_t *io; + struct efi_file_path_dev_path *fpath; + efi_handle_t handle; + efi_status_t status; + + /* See if the text to device path protocol exists */ + if (!text_to_dp && + efi_bs_call(locate_protocol, &text_to_dp_guid, NULL, + (void **)&text_to_dp) != EFI_SUCCESS) + return EFI_UNSUPPORTED; + + + /* Convert the filename wide string into a device path */ + initrd_dp = text_to_dp->convert_text_to_device_path(fi->filename); + + /* Check whether the device path in question implements simple FS */ + if ((efi_bs_call(locate_device_path, &fs_proto, &initrd_dp, &handle) ?: + efi_bs_call(handle_protocol, handle, &fs_proto, (void **)&io)) + != EFI_SUCCESS) + return EFI_NOT_FOUND; + + /* Check whether the remaining device path is a file device path */ + if (initrd_dp->type != EFI_DEV_MEDIA || + initrd_dp->sub_type != EFI_DEV_MEDIA_FILE) { + efi_warn("Unexpected device path node type: (%x, %x)\n", + initrd_dp->type, initrd_dp->sub_type); + return EFI_LOAD_ERROR; + } + + /* Copy the remaining file path into the fi structure */ + fpath = (struct efi_file_path_dev_path *)initrd_dp; + memcpy(fi->filename, fpath->filename, + min(sizeof(fi->filename), + fpath->header.length - sizeof(fpath->header))); + + status = io->open_volume(io, volume); + if (status != EFI_SUCCESS) + efi_err("Failed to open volume\n"); + + return status; +} + /* * Check the cmdline for a LILO-style file= arguments. * @@ -170,11 +222,13 @@ efi_status_t handle_cmdline_files(efi_loaded_image_t *image, cmdline += offset; cmdline_len -= offset; - if (!volume) { + status = efi_open_device_path(&volume, &fi); + if (status == EFI_UNSUPPORTED || status == EFI_NOT_FOUND) + /* try the volume that holds the kernel itself */ status = efi_open_volume(image, &volume); - if (status != EFI_SUCCESS) - return status; - } + + if (status != EFI_SUCCESS) + goto err_free_alloc; status = efi_open_file(volume, &fi, &file, &size); if (status != EFI_SUCCESS) @@ -231,14 +285,12 @@ efi_status_t handle_cmdline_files(efi_loaded_image_t *image, size -= chunksize; } file->close(file); + volume->close(volume); } while (offset > 0); *load_addr = alloc_addr; *load_size = alloc_size; - if (volume) - volume->close(volume); - if (*load_size == 0) return EFI_NOT_READY; return EFI_SUCCESS; @@ -248,6 +300,8 @@ err_close_file: err_close_volume: volume->close(volume); + +err_free_alloc: efi_free(alloc_size, alloc_addr); return status; } diff --git a/include/linux/efi.h b/include/linux/efi.h index 2d4d5a7fd781..ee034f0c5cc2 100644 --- a/include/linux/efi.h +++ b/include/linux/efi.h @@ -371,6 +371,7 @@ void efi_native_runtime_setup(void); #define LOADED_IMAGE_DEVICE_PATH_PROTOCOL_GUID EFI_GUID(0xbc62157e, 0x3e33, 0x4fec, 0x99, 0x20, 0x2d, 0x3b, 0x36, 0xd7, 0x50, 0xdf) #define EFI_DEVICE_PATH_PROTOCOL_GUID EFI_GUID(0x09576e91, 0x6d3f, 0x11d2, 0x8e, 0x39, 0x00, 0xa0, 0xc9, 0x69, 0x72, 0x3b) #define EFI_DEVICE_PATH_TO_TEXT_PROTOCOL_GUID EFI_GUID(0x8b843e20, 0x8132, 0x4852, 0x90, 0xcc, 0x55, 0x1a, 0x4e, 0x4a, 0x7f, 0x1c) +#define EFI_DEVICE_PATH_FROM_TEXT_PROTOCOL_GUID EFI_GUID(0x05c99a21, 0xc70f, 0x4ad2, 0x8a, 0x5f, 0x35, 0xdf, 0x33, 0x43, 0xf5, 0x1e) #define EFI_GRAPHICS_OUTPUT_PROTOCOL_GUID EFI_GUID(0x9042a9de, 0x23dc, 0x4a38, 0x96, 0xfb, 0x7a, 0xde, 0xd0, 0x80, 0x51, 0x6a) #define EFI_UGA_PROTOCOL_GUID EFI_GUID(0x982c298b, 0xf4fa, 0x41cb, 0xb8, 0x38, 0x77, 0xaa, 0x68, 0x8f, 0xb8, 0x39) #define EFI_PCI_IO_PROTOCOL_GUID EFI_GUID(0x4cf5b200, 0x68b8, 0x4ca5, 0x9e, 0xec, 0xb2, 0x3e, 0x3f, 0x50, 0x02, 0x9a) @@ -1011,6 +1012,11 @@ struct efi_mem_mapped_dev_path { u64 ending_addr; } __packed; +struct efi_file_path_dev_path { + struct efi_generic_dev_path header; + efi_char16_t filename[]; +} __packed; + struct efi_dev_path { union { struct efi_generic_dev_path header; |